| Regimental number | 65 |
| Place of birth | Melbourne, Victoria |
| Other Names | Armstrong, William Louther |
| Religion | Presbyterian |
| Occupation | Medical student |
| Address | 'Eden Park', Brighton, Victoria |
| Marital status | Single |
| Age at embarkation | 22 |
| Next of kin | W L Armstrong, c/o Colonel Merrett, 'Eden Park', Brighton, Victoria |
| Enlistment date | 18 August 1914 |
| Rank on enlistment | Corporal |
| Unit name | 1st Light Horse Field Ambulance, A Squadron |
| AWM Embarkation Roll number | 26/39/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board Transport A27 Southern on 23 September 1914 |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 1st Light Horse Field Ambulance |
| Fate | Returned to Australia 5 July 1915 |
